帮我做一条英文的数学题IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?A r=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不
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![帮我做一条英文的数学题IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?A r=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不](/uploads/image/z/5145709-13-9.jpg?t=%E5%B8%AE%E6%88%91%E5%81%9A%E4%B8%80%E6%9D%A1%E8%8B%B1%E6%96%87%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98IN+the+xy-plane%2Cline+m+is+the+reflection+of+line+l+across+the+x-asix.If+The+intersection+of+lines+l+and+m+is+the+point%28r%2Cs%29%2Cwhich+of+the+following+must+be+true%3FA+r%3D0B+s%3D0c+r%3DsD+r%3D-sE+rs%3D-1%E6%88%91%E7%9F%A5%E9%81%93%E7%AD%94%E6%A1%88%E6%98%AFb%2C%E4%BD%86%E6%98%AF%E4%B8%8D)
帮我做一条英文的数学题IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?A r=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不
帮我做一条英文的数学题
IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?
A r=0
B s=0
c r=s
D r=-s
E rs=-1
我知道答案是b,但是不知道为什么.
帮我做一条英文的数学题IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?A r=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不
xy-平面上,直线m是直线l关于x轴的镜像.如果直线m和l的交点为(r,s).以下哪个是正确的?
A r=0
B s=0 -------- 正确!
c r=s
D r=-s
E rs=-1
放你一对啦就行了